The Grand Duchy Research Project identifies documents relating to the lives of Jewish families who lived in Poland-Lithuania during the 17th and 18th centuries, and translates and publishes them on the Jewish Family History Foundation Website. Poll-Tax/census lists made in 1784 and 1765 are the primary documents included in this phase of the project.

Early 19th century Russian Revision Lists and additional revision lists (1805,1811,1816, 1818, 1834) serve as bridges between 19th century records where Jews first had surnames, and the earlier 18th century GDL records where they rarely had them. Instead the 18th century records used given names and father's names (patronymics.)

In the territory that later became Lithuania and Belarus, the most useful Bridge Records are the revision lists. These include many early revision lists that are in the All Lithuania Database (ALD) including: